If you are going to use a ball hitch, then the rule of thumb is that your "tongue weight" is 10-15% of what your "loaded" trailer, or in this case, a vehicle is. If your gross vehicle weight on the Wrangler is 3900 lbs, then your tongue weight is going to be around 390 lbs. You also have to take into consideration that unlike a trailer, where the arm between your ball and the axle of the towed vehicle is much longer, and as all 4 wheels are on the ground, your actual tongue weight is going to be somewhat less due to the distribution of weight on the vehicle suspension. If you opt to go for a Blue Ox or Roadmaster, towing system, then they are also "weight distributing". I think there is a misconception that ALL of the vehicle weight is going to be focused on your hitch and then distributed forward. No. Now if you decide that you're going to pull the jeep with the transmission in Park and the emergency brake on, OR pull 20% grades, then ok, your fears may be valid. I have seen class C gassers pulling 3/4 ton pickups flat. But my intuition is that they still are not close to the "rated tongue weight" for the hitch. If you use a tow dolly,with the front wheels on the dolly, then that figure becomes more important for obvious reasons! On 5th wheels, the gooseneck is rated at 15-30% of the loaded weight!